101 lines
3.8 KiB
Go
101 lines
3.8 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/consensus/ethash"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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)
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func ExampleGenerateChain() {
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var (
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key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
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key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
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key3, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
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addr1 = crypto.PubkeyToAddress(key1.PublicKey)
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addr2 = crypto.PubkeyToAddress(key2.PublicKey)
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addr3 = crypto.PubkeyToAddress(key3.PublicKey)
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db = rawdb.NewMemoryDatabase()
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)
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// Ensure that key1 has some funds in the genesis block.
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gspec := &Genesis{
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Config: ¶ms.ChainConfig{HomesteadBlock: new(big.Int)},
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Alloc: GenesisAlloc{addr1: {Balance: big.NewInt(1000000)}},
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}
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genesis := gspec.MustCommit(db)
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// This call generates a chain of 5 blocks. The function runs for
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// each block and adds different features to gen based on the
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// block index.
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signer := types.HomesteadSigner{}
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chain, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, 5, func(i int, gen *BlockGen) {
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switch i {
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case 0:
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// In block 1, addr1 sends addr2 some ether.
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tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), params.TxGas, nil, nil), signer, key1)
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gen.AddTx(tx)
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case 1:
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// In block 2, addr1 sends some more ether to addr2.
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// addr2 passes it on to addr3.
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tx1, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), params.TxGas, nil, nil), signer, key1)
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tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil), signer, key2)
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gen.AddTx(tx1)
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gen.AddTx(tx2)
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case 2:
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// Block 3 is empty but was mined by addr3.
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gen.SetCoinbase(addr3)
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gen.SetExtra([]byte("yeehaw"))
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case 3:
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// Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
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b2 := gen.PrevBlock(1).Header()
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b2.Extra = []byte("foo")
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gen.AddUncle(b2)
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b3 := gen.PrevBlock(2).Header()
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b3.Extra = []byte("foo")
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gen.AddUncle(b3)
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}
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})
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// Import the chain. This runs all block validation rules.
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blockchain, _ := NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{}, nil)
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defer blockchain.Stop()
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if i, err := blockchain.InsertChain(chain); err != nil {
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fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
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return
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}
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state, _ := blockchain.State()
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fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
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fmt.Println("balance of addr1:", state.GetBalance(addr1))
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fmt.Println("balance of addr2:", state.GetBalance(addr2))
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fmt.Println("balance of addr3:", state.GetBalance(addr3))
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// Output:
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// last block: #5
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// balance of addr1: 989000
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// balance of addr2: 10000
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// balance of addr3: 19687500000000001000
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}
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